Add message loop post for shim layer

#include <cstdint>

#define LOG_TAG "bt_shim"

#include "common/message_loop_thread.h"

#include "main/shim/entry.h"

#include "main/shim/shim.h"

#include "osi/include/log.h"

#include "osi/include/properties.h"

static const char* kPropertyKey = "bluetooth.gd.enabled";

static bluetooth::common::MessageLoopThread bt_shim_thread("bt_shim_thread");

static bool gd_shim_enabled_ = false;

static bool gd_shim_property_checked_ = false;

future_t* ShimModuleStartUp() {

  bt_shim_thread.StartUp();

  CHECK(bt_shim_thread.IsRunning())

      << "Unable to start bt shim message loop thread.";

  bluetooth::shim::StartGabeldorscheStack();

  return nullptr;

}

future_t* ShimModuleShutDown() {

  bluetooth::shim::StopGabeldorscheStack();

  bt_shim_thread.ShutDown();

  return nullptr;

}

EXPORT_SYMBOL extern const module_t gd_shim_module = {

    .name = GD_SHIM_MODULE,

    .init = nullptr,

    .start_up = bluetooth::shim::StartGabeldorscheStack,

    .shut_down = bluetooth::shim::StopGabeldorscheStack,

    .start_up = ShimModuleStartUp,

    .shut_down = ShimModuleShutDown,

    .clean_up = NULL,

    .dependencies = {NULL}};

void bluetooth::shim::Post(base::OnceClosure task) {

  bt_shim_thread.DoInThread(FROM_HERE, std::move(task));

}

bool bluetooth::shim::is_gd_shim_enabled() {

  if (!gd_shim_property_checked_) {

    gd_shim_property_checked_ = true;

/**

 * Gabeldorsche related legacy-only-stack-side expansion and support code.

 */

#include "base/bind.h"

#include "btcore/include/module.h"

#include "main/shim/entry.h"

namespace bluetooth {

namespace shim {

/**

 * Checks if the bluetooth stack is running in legacy or gd mode.

 *

 * This check is used throughout the legacy stack to determine which

 * methods, classes or functions to invoke.  The default (false) mode

 * is the legacy mode which runs the original legacy bluetooth stack.

 * When enabled (true) the core portion of the gd stack is invoked

 * at key points to execute equivalent functionality using the

 * gd core components.

 *

 * @return true if using gd shim core, false if using legacy.

 */

bool is_gd_shim_enabled();

/**

 * Posts a task on the shim message queue.

 *

 * @param task Task to be posted onto the message queue.

 */

void Post(base::OnceClosure task);

}  // namespace shim

}  // namespace bluetooth